A critical review on the technique and mechanism of microwave-based denitrification in flue gas

•Technique and mechanism of microwave-based denitrification are reviewed.•Thermal and non-thermal effects of microwave on the denitrification are summarized.•MW discharge reduction, MW catalytic reduction, MW-induced oxidation are introduced.•Future prospects and directions on MW-based denitrificati...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2022-10, Vol.120, p.144-157
Main Authors: Yuan, Bo, Qian, Zhen, Zhangc, Zili, Fu, Le, Pan, Shihang, Hao, Runlong, Zhao, Yi
Format: Article
Language:English
Subjects:
Denitrification
Microwave
Oxidation
Radical
Reduction
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Summary:•Technique and mechanism of microwave-based denitrification are reviewed.•Thermal and non-thermal effects of microwave on the denitrification are summarized.•MW discharge reduction, MW catalytic reduction, MW-induced oxidation are introduced.•Future prospects and directions on MW-based denitrification are provided. Microwave radiation has received extensive attention due to its significant thermal and non-thermal effects, and the development of MW-based denitrification in flue gas has become one of the most promising methods to avoid the defects of ammonia escape, high temperature and cost in traditional SCR. This review introduces the thermal and non-thermal effects of microwaves and divides MW-based denitrification methods into MW reduction and oxidation denitrification, systematically summarizes these denitrification methods, including MW discharge reduction, MW-induced catalytic reduction using active carbon, molecular sieves, metal oxides (transition metals, perovskites, etc.), MW-induced oxidation denitrification with and without additional oxidant, and discusses their removal pathway and mechanism. Finally, several research prospects and directions regarding the development of microwave-based denitrification methods are provided. [Display omitted]
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2021.06.020